Why we find Sofia Richie's relationship with Scott Disick so hard to swallow.

Sofia Richie is the youngest daughter of legendary singer and songwriter Lionel Richie.

At just 19 years old, she’s already joined the ranks of celebrity ‘It’ children – the offspring of some of the world’s most famous faces – and counts Michael Jackson’s daughter, Paris, as one of her closest friends.

And as of three days ago, she’s officially announced she is dating Keeping Up With The Kardashians personality Scott Disick.

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The couple's many therapy sessions, break-ups, Scott's treatment in rehab facilities for alcohol addiction, and a confession earlier this year that he was a "horrible sex addict" have all been on full display to the public.

Overnight, ex-partner Kourtney made claims on the E! show that Disick was "with a different hooker every day" towards the conclusion of their relationship.

On one hand, we have a teenager, barely out of school. On the other? A much older man, notorious for leaving a trail of destruction in his wake.

Unsurprisingly, there's something about this relationship, the pairing of these two particular individuals, that is making onlookers more than a little uncomfortable. Although a 15-year age difference is far from significant, it's hardly the most pressing issue at play when it comes to Sofia and Scott.

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Growing up in the spotlight, as Sofia has done, has surely forced her to grow up more quickly than some other women her age. Perhaps she's more mature, having been surrounded by 'grown-ups' for most of her life.

Besides, we've seen plenty of other high-profile relationships with the same - if not bigger - age differences thrive.

Perhaps it's more the fact that in the weeks following Scott's 'sex addict' confession and leading up to his 'Instagram official' relationship with Sofia, he has been linked to a number of women.

This year alone, Disick has been linked to his 27-year-old ex-girlfriend (and Sofia's long time friend) Chloe Bartoli, 19-year-old actress Bella Thorne and 20-year-old model Bella Banos.

Disick, it seems, has a penchant for those much younger and, perhaps, naive than he is.

Scott has also been linked to 19-year-old actress Bella Thorne in recent months. Image via Instagram.

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As soon as the public believes Scott has 'settled down' with a new love, he's spotted partying with someone else. And the young ex? Discarded.

It's precisely due to this reputation that Sofia's own father Lionel Richie has made public his "reservations" about his youngest daughter's new relationship.

Speaking to Us Weekly, the 68-year-old admitted he was "scared to death" of Sofia's new relationship with Scott.

This, coming from a father who watched his oldest daughter, Nicole, go through bouts of drug addiction, rehab programs and face jail time.